The Place Name is used by the ACS Atlas (if installed) to look up the latitude, longitude, and time zone of the location. The format is city name, country name (or province name) with a comma and a space between the city name and country name. When you exit this field the ACS Atlas will look up the location and enter the latitude, longitude and time zone of this location. If the location is not found then the ACS Atlas window will appear if installed. If there is more than one location by the same name, then just to the right of the latitude field there will be a flashing red text that says "duplicates". If this shows, you must click on the globe button attached to the Place Name edit field and the Atlas window will appear. From here you will have to select which of the cities by the same name you want to use.